Grain cleaner



Feb. 7, 1928.

P. S. LARSON GRAIN CLEANER Filed Nov. 20, 1925 Patented Feb. 7, 1928.

UNITED STATES Leashes FATE. orricsE.

PETER, S. LARSON, OF MINNJJAZOLIS, MINNESOTA, ASSIGNOR OF. ONE-HALF TO ANTHONY B. 'SPABBOE, 01-? I/IINE EAPGLIS, MINNESOTA.

GRAIN CLEANER.

Application filed. November This invention relates to grain separators or cleaners and especially to those constructed to repeat the run of the grain over a series of sieves. in mostconnnercial cleaners in use at this time the uncleanedgrain is delivered to the topmost of a series or gang; ot' inclined sieves, through which kernels of grain pass as well as a considerable amount of cats and undesirable material. A substantial proportion of the material and grain passing throughthis gang returned to the top or the separator through therepeatspout and goes. through the repeat run over said gang of sieves. Obviously, the reti'lrn oi this large amount of material including a considerable amount of oats and other undesirable material clogs the sieves in the regu .lar run or and. of necessity lessens the co-cfliciency of the sieves in connection with the usual fans in separating the kernels of grain.

It is the main object of this invention to. provide a highly efficient grainseparator or attachment for a standard grainseparator which will greatly increase the capacity and speed of standard'devices of this nature commercially sold at'this time.

A further object of the invention is to provide in a grain separator havingvan elevator and a repeat delivery spout connected thereto, simple but e'tliclent means tor removing the greater part of undesirable material from the repeat run before the repeat material reaches the regular run or gang, and, moreover, for delivering the repeat grain to the forward end or starting point of the regular run rather than to the intermediate portion of the top sieve of the gang as is the case in most cleaners. The sieves of the regular gang will. thus be practically unclogged by any repeat material and will be in condition to handle the uncleaned grain delivered from the hopper much faster and with greater elliciency. Furthermore, by delivering cleaned grain from the repeat run to the forward end of the top. sieve of the regular run, the weight oi? the heavier kernels of cleaned grain will. more quickly push 03 the cats, chaff and other undesirable material as they slide down and through the sieves.

The invention has for its object to provide efficient auxiliary cleaning means disposed beneath the delivery end of the repeat spout adapted to remove said undesirable material from the separator or cleaner and provided 20, 1925. Serial HO. 70,303.

with a chute or deck therebeneath adapted to collect the grain passing through said auxiliary cleaning means and return the same to the starting point of the regular run.

These and other objects of the invention will be apparent from the following description made in connection with the accompany ing drawings wherein like characters refer to similar-parts throughout the several views and in which Fig. 1 is a longitudinal vertical section of an embodiment of the invention, and

2 is a detailed fragmentary vertical section on a larger scale showing the relative position and construction of the auxiliary screening means.

In the drawings, a suitable upright frame 3 is provided having the usual fan 4 driven within the casing 5. A movable shoe 6 has mounted therein a plurality of transversely disposed inclined sieves 7 forming the regular run, the upper one of which, 7, is continuously connected to a deck 7 lying preterably in the same plane and extending be neath the delivery hopper 8 in position to ceive grain therefrom. Sieves 7 are spaced apart in the usual way, there being greater distance between their respective forward ends than between their respective rear ends. Hopper 8 is provided with the usual feedgates 9 and 10, respectively, adapted to control the admission of grain into the cleaner. The tailing spout 11 is provided in the rear end of the machine adapted to receive the oatsland other tailings from the rear ends of the sieves 7.

A tubular casing- 12, having an enlarged receiving throat, is mounted in frame 3 above and behind the rear end of sieves 7 communi eating with the-fan l3 driven within the casing let at the top or" the machine. The enlarged throat of casing. 12 directly above the rear en'dsotthe sieves" 7 in position to suck up the chat-l and lighter material driven oil the said sieves. Adjacent the bottom oi. shoe 6 a pair of forwardly inclined sieves 15 are disposed, the top sci" i'bein'g' of considerably larger: mesh than the} lower-screen. The cleaned grain will slide down theupper; screen 15 through theispout 1'6 and the time screenings or seed will sift tln-ouglrth lower or finer screen 15 and be delivered through spout 17. i

A repeat board 18 ofusual constructionis disposed beneath thercgular gan of sieves lllfi viously sifteditln'ough sieves T to the top of the machine through a depending repeat spout 20, the delivery end of which lies above a repeat spreader device 22 of standard form extending horizontally across the forward end of the machine and disposed a short distance ltlOlll the rear of the delivery end (it hopper 8 and adapted to cooperate with one side of the lower end of hopper 8 to deliver the grain therefrom in a thin sheet.

Below the spreader device the applicant provides a plurality, preferably a pair, of substantially parallel spaced inclined sieves 23 supported by and acrosstbe shoe 6 and preferably extending above the regular gang of sieves 7. The forward ends o't' sieves .33 are disposed at a higher level than the rear ends and said sieves extend from beneath the delivery point of the repeat grain to approximately the end of the regular run.

-i Beneath the lower sieve 23 a. slide or deck 24 is provided preferably secured to shoe and extending from a line just below the rear end of lower sieve 23 to a line just above the forward end of the topmost sieve TKof the regular run. Slide 24- has its rearwardend disposed at a higher level than its forward end whereby the grain screened'by sieves 23 will be delivered. to the starting point of the regular cleaning run.

It may be readily be seen that applicants invention will not require the building ota complete new grain separator unless desired since, by merely removing the top sieve oi?- the regular gang employed in most standard cleaners to provide additional space, the auxiliary sieves 23 and deck 24; may be installed as an attachmentto most forms of cleaners provided for a repeat run of grain.

Operation.

and other material falls into the lower portion of the elevator 19 for the repuit run while the kernels of grain dropping through the forward portion of the lower sieve 7 fall upon the screens 15, the liner screenings and seeds going through and out of the machine 7 by the spout 17 and the cleaned grain being delivered through trough 16;. The repeat grain and material is delivered from the elevator 19 through the repeat spout 20 and spread out by means oi the device dropping to form a comparatively even sheet upon the top auxiliary sieve 2 3. Sicves 23 take oil the greater amount of the oats, chatl' and other undesirable material and the screenedgrain and such small :unounts of other material as may get through these sieves is delivered in a thin even sheet by slide or deck to the extrennforward end of the topmost sieve 7 oi the regular run, and, thus, the regular run is not impeded and clogged by having a great mass of oats and undesirable material thrown thereon but will be practi fally freed of such material as far as the repeat grain is concerned. Sieves 7 will thus function much more eiiiciently and the grain will be more quickly separated by the use of applicants device.

Moreover, the weight of the cleaned grain falling on the regular run of sieves and rolling theredown assists in throwing oil the lighter or undesirable material in the first run over sieves 7. Applicant has made careful tests with this device in separatin wheat, and has ifound that, whereas, a stan ard separator will return approximately of wheat and of oats and other material, by the use of his device ot wheat is returned on the repeat run to the forward end of the topmost sieve of the regular run and only 25% other material.

Front the above description, it will be seen that applicant has invented a highly uset'ul improvement in grain separators and cleaners capable of speeding up the action of such devices and consequently greatly increasing the capacity and efiicieney of the same.

It will, of course, he understood that various changes may be made in the form, (1etails, proportions and arrangement of parts without departing from the scope of the invention.

that is claimed is:

1. In a grain separator a main gang of inclined sieves, means for delivering uucleaned grain on the upper sieve oil. said gang, :1 repeat elevator adapted to receive a considerable portion of the material pass .ing through said main gang, distriluiliug means below the. upper end of said elevator adapted to deliver the repeat grain in a thin sheet, an inclined auxiliary screen dispr'ised between said distributing means and the upper sieve of said main gal-lg adapted t o remove a, large amount of the undesirable material from the run, and permit the heavier desirable material to pass therethrough and a deekor chute disposed be tween said auxiliary screen and the upper sieverot said gang adapted to collect said heavier material and distribute the same in a substantially even sheet at the forward,

lltl

end of the upper siere" of said main gang, whereby the same Will assist in throwing oil the lighter material. from the regular run.

2. in a grain separator, a main gang oi separator sieves, means for delivering uneleaned grain to the upper sieve of said gang, a return run elevator adapted to receive a considerable portion of the main run of material passing through said niain ganm means to which said elevator is adapted to deliver for removing a large amount of the lighter material in said return run before redelivery to said gang and means for delivering the heavier desirable material in said return run to the upper portion of the upper sieve or said gan In a grain separator, a main gang of separator sieves, means for delivering uncleaned grain to the upper sieve of said gang, a return run elevator adapted to receive a considerable portion of the main run of material passing through said main gang, auxiliary screening means to which said elevator is adapted to deliver and which is adapted to remove a large amount of the lighter undesirable material in the return PETER S. LARSON. 

